/Engine/Plugins/MovieScene/SequencerScripting/Source/SequencerScripting/Public/ExtensionLibraries/MovieSceneSequenceExtensions.h
The frame number to find the next/previous user marked frame from  Find forward from the given frame number.
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintCallable, Category="Sequencer|Sequence", Meta=(ScriptMethod)) static int32 FindNextMarkedFrame ( [UMovieSceneSequence](API\Runtime\MovieScene\UMovieSceneSequence) * Sequence, [FFrameNumber](API\Runtime\Core\Misc\FFrameNumber) InFrameNumber, bool bForward )